Machine Design
The angle of twist of shaft is

Inversely proportional to (shaft diameter)²
Directly proportional to (shaft diameter)²
Directly proportional to (shaft diameter)⁴
Inversely proportional to (shaft diameter)⁴

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Machine Design
When the shaft rotates in anticlockwise direction at high speed in a bearing, it will

Move towards right of the bearing making no metal to metal contact
Move towards left of the bearing making metal to metal contact
Move towards right of the bearing making metal to metal contact
Have contact at the bottom most of the bearing

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